The Synthesis of (3'-Oxo-3',4'-dihydro-2'H-1',4'-benzothiazin-2'-yl)acetic Acid and (3'-Oxo-3',4'-dihydro-2'H-1',4'-benzoxazin-2'-yl)acetic Acid Derivatives
Reaction of o-aminophenol with various maleic anhydrides gave first 2-hydroxymaleanilic acids (4-(2'-hydroxyphenylamino)-4-oxobut-2-enoic acids) (1), which were then converted into the 3-oxo-1,4-benzoxazines (1d-h) and (3f-l) under mild basic conditions:
Teitei, Tsutomu
p. 503 - 510
(2007/10/02)
A Simple Synthesis of 2,2'-Bisbenzimidazolylethylen And Its Analogues
o-Aminomaleanilic acid (IIa) has been conveniently prepared and employed as a novel synthon for one-step synthesis of 2,2'-bisbenzimidazolylethylene (IIIa) in polyphosphoric acid medium.Analogous compounds (IIIb-f)have also been synthesized from o-hydroxy- and o-mercaptomaleanilic acids (IIb and IIc) following a similar procedure.
Dash, Bhabagrahi,Dora, Essilidi K.,Panda, Chandra S.
p. 697 - 698
(2007/10/02)
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